| Mastnejparek vs King | 6–5 | 54.55% |
| Mastnejparek vs Reina | 8–3 | 72.73% |
| Mastnejparek vs Lili | 6–3 | 66.67% |
| Mastnejparek vs Jin | 5–3 | 62.50% |
| Mastnejparek vs Kazuya | 4–3 | 57.14% |
| Mastnejparek vs Steve | 4–3 | 57.14% |
| Mastnejparek vs Jack-8 | 3–2 | 60.00% |
| Mastnejparek vs Eddy | 2–3 | 40.00% |
| Mastnejparek vs Law | 4–0 | 100.00% |
| Mastnejparek vs Hwoarang | 3–1 | 75.00% |
| Mastnejparek vs Nina | 1–3 | 25.00% |
| Mastnejparek vs Jun | 4–0 | 100.00% |
| Mastnejparek vs Paul | 2–1 | 66.67% |
| Mastnejparek vs Yoshimitsu | 2–1 | 66.67% |
| Mastnejparek vs Bryan | 0–3 | 0.00% |
| Mastnejparek vs Dragunov | 3–0 | 100.00% |
| Mastnejparek vs Leo | 1–2 | 33.33% |
| Mastnejparek vs Alisa | 0–3 | 0.00% |
| Mastnejparek vs Victor | 2–1 | 66.67% |
| Mastnejparek vs Heihachi | 2–1 | 66.67% |
| Mastnejparek vs Anna | 1–2 | 33.33% |
| Mastnejparek vs Asuka | 2–0 | 100.00% |
| Mastnejparek vs Leroy | 2–0 | 100.00% |
| Mastnejparek vs Claudio | 1–0 | 100.00% |
| Mastnejparek vs Lee | 1–0 | 100.00% |
| Mastnejparek vs Kuma | 1–0 | 100.00% |
| Mastnejparek vs Zafina | 1–0 | 100.00% |
| Mastnejparek vs Azucena | 1–0 | 100.00% |
| Mastnejparek vs Raven | 0–1 | 0.00% |
Limitations
This data is often requested to give insight into which characters you have more trouble with than others, but it is not particularly helpful for that. The main issue is that it is heavily skewed by how strong the opponents you play are.
For example, this data suggests my worst matchup is clearly vs Reina, but that's just because most of those games are vs Yagami.
There is a way to account for this being worked on. The central idea is to assign each matchup a rating vs you which adjusts based on the result, much like the regular rating but also based on the rating of each player. With this, it would give a better summary of how well you perform vs each character.
In the meantime, this page is here to present the data as requested.